Rainfall in Saint-Julien-de-l'Herms tops that of 87% of mainland French towns: 1,004 mm a year
The depth of winter brings overnight lows near 0.5°C. Its January nights bite harder than in 80% of mainland French towns. A year here swings 26°C from midwinter lows to midsummer highs. The heating season runs November to March: each of those months averages under 10°C.
These are the figures of Météo-France’s Saint-Christophe-L station, 23 km south.
A year in Saint-Julien-de-l'Herms at a glance
Each month’s typical high and low in °C, at the Saint-Christophe-L station.
What a year in Saint-Julien-de-l'Herms feels like
Typical highs and lows by season and by month, from Météo-France’s 1991–2020 normals at Saint-Christophe-L.
About 1,004 mm of rain a year
October is the wettest month and February the driest. About 30 days a year bring 10 mm or more. 45th wettest of 110 towns of 2,500+ in Isère.
Rain by month
Millimeters
Sunshine by month
Hours of sunshine at Grenoble-Saint-Geoirs
A frosty town: 51 frosts and 69 days of 25°C a year
On about 51 nights a year the air drops to 0°C or below, and on about 9 days it stays below freezing all day. About 69 days a year reach 25°C, and 20 reach 30°C.
Day counts are Météo-France’s 1991–2020 normals at Saint-Christophe-L: a frost is a night of 0°C or below, a summer day (jour d’été) 25°C or more, a hot day (forte chaleur) 30°C or more.
The Météo-France station at Saint-Christophe-L
Saint-Christophe-L is 23 km south of Saint-Julien-de-l'Herms. Every figure on this page is the station’s, not a measurement in Saint-Julien-de-l'Herms itself.
| Station (Météo-France number) | Saint-Christophe-L (26298001) |
| Distance from the town | 23 km south |
| Station altitude | 452 m |
| Town altitude (its center) | 470 m |
| Period | 1991–2020 |
| Nearest station of any kind | 19 km |
| Sunshine measured at | Grenoble-Saint-Geoirs, 19 km away |
TownRatings matches each commune to one station with at least 24 years of temperature and rain records: the nearest, counting every 100 m of height difference as 10 km, never across the sea.
How Saint-Julien-de-l'Herms compares
Against the 4,385 towns of 2,500 or more in mainland France, each read from its own matched station. The dots are the other towns of 2,500+ in Isère.
Nearby towns’ climate
The nearest towns of 2,500+ within 29 km, each with its own matched station.
| Town | Station | July high | January low | Rain a year |
|---|---|---|---|---|
| Saint-Julien-de-l'Herms | Saint-Christophe-L | 26.9°C | 0.5°C | 1,004 mm |
| Saint-Jean-de-Bournay 8.6 km | Grenoble-Saint-Geoirs | 27.1°C about the same | −0.7°C 1.2°C colder | 915 mm |
| Beaurepaire 11 km | Saint-Sorlin-en-Va | 28.6°C 1.7°C warmer | 1.2°C 0.7°C milder | 855 mm |
| Estrablin 14 km | Lyon-Bron | 28.2°C 1.3°C warmer | 1.1°C 0.6°C milder | 821 mm |
| La Côte-Saint-André 14 km | Grenoble-Saint-Geoirs | 27.1°C about the same | −0.7°C 1.2°C colder | 915 mm |
| Saint-Georges-d'Espéranche 14 km | Grenoble-Saint-Geoirs | 27.1°C about the same | −0.7°C 1.2°C colder | 915 mm |
| Diémoz 17 km | Lyon-Saint-Exupery | 27.5°C 0.6°C warmer | 1.1°C 0.6°C milder | 863 mm |
Saint-Julien-de-l'Herms weather by month
Average daily high and low, mean temperature and rain, 1991–2020, at the Saint-Christophe-L station; sunshine at Grenoble-Saint-Geoirs.
| Month | High | Low | Mean | Rain | Sun (hours) |
|---|---|---|---|---|---|
| January | 6.2°C | 0.5°C | 3.4°C | 69 mm | 91 |
| February | 7.7°C | 0.6°C | 4.2°C | 54 mm | 112 |
| March | 12.5°C | 3.4°C | 7.9°C | 66 mm | 173 |
| April | 16.1°C | 5.9°C | 11.0°C | 85 mm | 190 |
| May | 20.2°C | 9.6°C | 14.9°C | 97 mm | 221 |
| June | 24.3°C | 13.2°C | 18.7°C | 70 mm | 258 |
| July | 26.9°C | 15.4°C | 21.2°C | 68 mm | 292 |
| August | 26.8°C | 15.4°C | 21.1°C | 76 mm | 263 |
| September | 21.9°C | 11.9°C | 16.9°C | 112 mm | 199 |
| October | 16.6°C | 8.7°C | 12.6°C | 124 mm | 140 |
| November | 10.3°C | 4.1°C | 7.2°C | 116 mm | 91 |
| December | 6.8°C | 1.3°C | 4.0°C | 66 mm | 78 |
| Year | 16.4°C | 7.5°C | 11.9°C | 1,004 mm | 2,108 |
Where Saint-Julien-de-l'Herms’s numbers come from
Averages over 30 years, not a forecast.
- Temperature, rain and day counts: Météo-France’s fiche climatologique for Saint-Christophe-L, 23 km away: statistics for 1991–2020.
- Which station: among stations with at least 24 of the 30 years of temperature and rain, the nearest to the commune’s population-weighted center, counting each 100 m of height difference as 10 km; mainland towns use mainland stations and each overseas département its own.
- Altitudes: the town’s from IGN’s RGE ALTI® at its population-weighted center; the station’s from Météo-France.
- Sunshine: the nearest station with at least 10 years of sunshine records, Grenoble-Saint-Geoirs, 19 km away.
- Comparisons: every town of 2,500 or more in mainland France, read the same way; the dots are the towns of 2,500+ in Isère.
Météo-France fiches climatologiques · IGN RGE ALTI®. Licence Ouverte 2.0.
Questions about Saint-Julien-de-l'Herms’s climate
How warm does Saint-Julien-de-l'Herms get in summer?
July is the warmest month, with average highs of 26.9°C. About 69 days a year reach 25°C, more than 62% of mainland French towns, and about 20 reach 30°C.
How cold does Saint-Julien-de-l'Herms get in winter?
January nights average 0.5°C. The air drops to 0°C or below on about 51 nights a year, and about 9 days a year stay below freezing all day.
How much rain does Saint-Julien-de-l'Herms get?
About 1,004 mm a year, more than 87% of mainland French towns. October is the wettest month (124 mm) and February the driest (54 mm).
How sunny is it?
The nearest Météo-France station that records sunshine, Grenoble-Saint-Geoirs (19 km away), averages 2,108 hours of sunshine a year.
Are these figures for Saint-Julien-de-l'Herms itself?
No: they are the normals of the Météo-France station matched to Saint-Julien-de-l'Herms, Saint-Christophe-L, 23 km away. France publishes its climate normals by station, not by commune; a valley, a hill or the sea can make a difference over a few kilometers.
Where do these figures come from?
Météo-France’s fiches climatologiques: 30-year averages (1991–2020) for each of its long-running stations, published as open data since 2024. They are normals, not a forecast.
Source: Météo-France, fiches climatologiques, 1991–2020 statistics (station ST-CHRISTOPHE-L_SAPC, edited 15/10/2026); altitude: IGN, RGE ALTI®. Licence Ouverte 2.0. Today’s forecast for Saint-Julien-de-l'Herms →
Contains public sector information under the Licence Ouverte / Open Licence 2.0 (Etalab): INSEE, DGFiP, the Interior Ministry’s statistics service (SSMSI), the Ministry of Education (DEPP), the Health Ministry’s statistics service (DREES) and the Housing Ministry (Carte des loyers). Commune boundaries: IGN Admin Express.